Prominent

Before i start i did kinda OC my pentium to 4.2 but i left my voltages and other stuff to auto, i just need confirmation if that's alright and also if i could futher push my ghz to 4.3-4.5
and also kinda stupid but i didn't stress test, but is seem to average around 39-50 while doing light stuff, while gaming depending on what type of game and how demanding is normally around 60-70 ish on league of legends

I'm just wondering if i could push my ghz futher to around 4.3-4.5 (if that possibly) i heard that i need a more powerful power supply which if that's the case, is my current OC setting needing some twerking/ did i even did it right

Titan

It has been some time since I last overclocked a G3258.
I can not remember what a safe vcore voltage was for that chip.
I think 1.3 would be ok.
It probably is a moot point since you are likely to be limited by heat with the stock cooler.
CPU-Z has an easy stress test and it will show you your vcore.
HWmonitor will show you your temperatures.
About 85c. on a stress test will be your target.

The wattage needed is mostly for your GTX960 and hardly any for the cpu.
I would not worry about the psu.

Prominent

It has been some time since I last overclocked a G3258.
I can not remember what a safe vcore voltage was for that chip.
I think 1.3 would be ok.
It probably is a moot point since you are likely to be limited by heat with the stock cooler.
CPU-Z has an easy stress test and it will show you your vcore.
HWmonitor will show you your temperatures.
About 85c. on a stress test will be your target.

The wattage needed is mostly for your GTX960 and hardly any for the cpu.
I would not worry about the psu.

I should probably mention that i did try to change the voltage, i remember i change it to 1.108v which later crash my windows then i change it to 1.100v which also crash. I feel like those volts are under power is that true ?